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TS5213CX5 Folha de dados(PDF) 4 Page - Taiwan Semiconductor Company, Ltd

Nome de Peças TS5213CX5
Descrição Electrónicos  80mA Low Noise LDO Voltage Regulator with Enable Function
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Fabricante Electrônico  TSC [Taiwan Semiconductor Company, Ltd]
Página de início  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS5213CX5 Folha de dados(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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TS5213
80mA Low Noise LDO Voltage Regulator
with Enable Function
4/8
Version: B07
Application Information (Continue)
Thermal Characteristics
TS5213 series is designed to provide 80mA of continuous current in a very small package. Maximum power
dissipation can be calculated based on the output current and the voltage drop across the part. To determine the
maximum power dissipation of the package, use the junction-ambient thermal resistance of the device and the
following basic equation:
PD(MAX) = [ TJ(MAX) – TA ] /ΘJA
TJ(MAX) is the maximum junction temperature of the die(125
oC), and Ta is the ambient operating temperature. ΘJA is
layout dependent, the actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN – VOUT) * IOUT + VIN * IGND
Substituting Pd(max) for Pd and solving for the operating conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit. For example, when operating the TS5213CX550 at room
temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined
as follows:
PD(MAX) = (125
oC – 25oC) / 220oC/W
PD(MAX) = 455mW
The junction to ambient thermal resistance for the minimum footprint is 220
oC/W, the maximum power dissipation
must not be exceeded for proper operation. Using the output voltage of 5.0V and an output current of 80mA, the
maximum input voltage can be determined. Form the electrical characteristics table, the maximum ground current for
80mA output current is 1mA.
445mW = (VIN – 5.0V ) * 80mA + VIN * 1.8mA
445mW = VIN * 80mA – 5.0 * 80mA + VIN * 1.8mA
445mW = VIN * 80mA – 400mW + VIN * 1.8mA
845mW = VIN * 81.8mA
VIN (max) = 10.33V
Therefore, a 5.0V application at 80mA of output current can accept a maximum input voltage of 10.33V in a SOT-25
package.


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